From f7bdc2acff3c13a6d632c28c4569690ab106eed7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Picca=20Fr=C3=A9d=C3=A9ric-Emmanuel?=
 <picca@synchrotron-soleil.fr>
Date: Fri, 18 Aug 2017 14:48:52 +0200
Subject: Import Upstream version 0.5.0+dfsg

---
 silx/gui/_glutils/utils.py | 70 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 silx/gui/_glutils/utils.py

(limited to 'silx/gui/_glutils/utils.py')

diff --git a/silx/gui/_glutils/utils.py b/silx/gui/_glutils/utils.py
new file mode 100644
index 0000000..73af338
--- /dev/null
+++ b/silx/gui/_glutils/utils.py
@@ -0,0 +1,70 @@
+# coding: utf-8
+# /*##########################################################################
+#
+# Copyright (c) 2014-2017 European Synchrotron Radiation Facility
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+#
+# ###########################################################################*/
+"""This module provides conversion functions between OpenGL and numpy types.
+"""
+
+__authors__ = ["T. Vincent"]
+__license__ = "MIT"
+__date__ = "10/01/2017"
+
+from . import gl
+import numpy
+
+
+_GL_TYPE_SIZES = {
+    gl.GL_FLOAT: 4,
+    gl.GL_BYTE: 1,
+    gl.GL_SHORT: 2,
+    gl.GL_INT: 4,
+    gl.GL_UNSIGNED_BYTE: 1,
+    gl.GL_UNSIGNED_SHORT: 2,
+    gl.GL_UNSIGNED_INT: 4,
+}
+
+
+def sizeofGLType(type_):
+    """Returns the size in bytes of an element of type `type_`"""
+    return _GL_TYPE_SIZES[type_]
+
+
+_TYPE_CONVERTER = {
+    numpy.dtype(numpy.float32): gl.GL_FLOAT,
+    numpy.dtype(numpy.int8): gl.GL_BYTE,
+    numpy.dtype(numpy.int16): gl.GL_SHORT,
+    numpy.dtype(numpy.int32): gl.GL_INT,
+    numpy.dtype(numpy.uint8): gl.GL_UNSIGNED_BYTE,
+    numpy.dtype(numpy.uint16): gl.GL_UNSIGNED_SHORT,
+    numpy.dtype(numpy.uint32): gl.GL_UNSIGNED_INT,
+}
+
+
+def isSupportedGLType(type_):
+    """Test if a numpy type or dtype can be converted to a GL type."""
+    return numpy.dtype(type_) in _TYPE_CONVERTER
+
+
+def numpyToGLType(type_):
+    """Returns the GL type corresponding the provided numpy type or dtype."""
+    return _TYPE_CONVERTER[numpy.dtype(type_)]
-- 
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